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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1651 | $upload_error_strings = array(false, |
| 1652 | __("The uploaded file exceeds the <code>upload_max_filesize</code> directive in <code>php.ini</code>."), |
| 1653 | __("The uploaded file exceeds the <em>MAX_FILE_SIZE</em> directive that was specified in the HTML form."), |
| 1654 | __("The uploaded file was only partially uploaded."), |
| 1655 | __("No file was uploaded."), |
| 1656 | __("Missing a temporary folder."), |
| 1657 | __("Failed to write file to disk.")); |
| 1658 | |
| 1659 | // Accepted MIME types are set here as PCRE. Override with $override['mimes']. |
| 1660 | $mimes = apply_filters('upload_mimes', array ( |
| 1661 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 1662 | 'gif' => 'image/gif', |
| 1663 | 'png' => 'image/png', |
| 1664 | 'bmp' => 'image/bmp', |
| 1665 | 'tif|tiff' => 'image/tiff', |
| 1666 | 'ico' => 'image/x-icon', |
| 1667 | 'asf|asx|wax|wmv|wmx' => 'video/asf', |
| 1668 | 'avi' => 'video/avi', |
| 1669 | 'mov|qt' => 'video/quicktime', |